Although most of the traffic appears to be innocuous, Windows 10 is still communicating with Microsoft servers even when many data privacy settings are on, a report observed on Thursday.

After disabling the operating system’s Cortana assistant, and Web searches run from the Start menu, Windows 10 will still send requests to bing.com for a file with Cortana data, ArsTechnica noted. Attached to the request is a random machine ID that persists between sessions.